Democratic presidential contender Hillary Clinton won the backing of Housing and Urban Development Secretary Julian Castro on Thursday and said she would seriously consider making the rising Hispanic leader her running mate if she wins her party’s nomination.

Clinton and the other Democrats in the November 2016 race for the White House have pushed hard for support among Hispanics, a fast-growing and critical voting bloc that has moved toward Democrats in recent elections as Republicans have stymied comprehensive immigration reform in Congress and disparaged Mexican immigrants on the campaign trail.

“I am going to look really hard at him for anything, because that’s how good he is,” Clinton said at a U.S. Hispanic Chamber of Commerce meeting in San Antonio, Texas, when asked if Castro might be her vice presidential pick.